Scrolling Sections links a set of text annotations to a fixed visualization panel using a custom scroller built on D3's event dispatcher and `d3.bisect`. As the user scrolls, the scroller calculates the current section index and emits `active` and `progress` events, which the visualization uses to update its display. The page layers scrolling text over a fixed SVG area via CSS `position: fixed`, with each section providing narrative context for the animated visualization.